Dustin Diamond
You know what I think Dustin Diamond's problem is? First of all, he was two years younger than everyone else and yet he was expected to be as mature as they were. That's a lot of pressure for a kid, because he wasn't just being told to 'act his age,' he's being told to act two years older than he was. And I mean, he wasn't playing Zack or Slater, he was the geek. I have a feeling he was treated as such on and off screen. Maybe the cast teased him, which as an adult he probably would have shrugged off. but as a kid, you're so much more sensitive. He likely took some of their jokes to heart as real ridicule. While the rest of the cast was dating each other, and no one wanted him because it would have been like dating the kid. I can understand his feeling of being left out.
I think above all else, he just wanted to be an equal. but he never quite was. And because this was his entire childhood, he didn't just grow out of it. It was all he knew. So he grew up sort of bitter, leading him to sort of come out as an jerk, a slob, rude and obnoxious to try and shed that geeky Screech persona. Bad mouthing the rest of the cast, writing a book that bashes them all (which now he says he didn't write) making a porno (which now he says he didn't do.) I think there is a truth and reason to why he is the way he is, but it's yet to be told.
This recent SBTB movie was from his perspective, but was honestly really tame compared to his book. It showed the kids teasing and picking on him, but no drug use or anything. Honestly, I think this movie was his apology to them for all the stuff he's pulled in the last decades. Showing that all in all, they were just teenagers. Teenage stars no less with rising egos. But nothing they did was ever *personal,* and I think he's finally coming to terms that. He definitely could have handled it all better though, because he made it really hard for anyone to like him.